Anatomy Of The Eye Fkg.ppt

ANATOMY OF THE EYE Department of Ophthalmology Faculty of Medicine Universitas Padjadjaran

Orbital Walls

Orbital Walls

ANTERIOR PART OF THE EYE

The wall of the eye ball composed of a dense elastic supporting : - Anterior part (transparent)  Cornea - Anterior part covered the sclera  conjunctiva - Junction between Cornea & conjunctiva  limbus

TEAR FILM Lipid : prod. by meiboman gland F/ tear evaporation,  tear stability Aquous: prod. By lacrimal gland F/ Transport all water soluble nutriens Mucin : prod. by conjunctival goblet cell F/  ability aquous layer to spread through corneal epithel

CORNEAL LAYER EPITHELIUM: Continuation of the conjunctiva over the cornea Bowman’s Layer STROMA Forming 90 % of total Corneal Descemet Membrane Thin elastic membrane covered on its posterior by Endothelium Endothelium Controling stromal hydration, become less in number of age

Anterior Chamber

Ant. Camber : space filled with aquous humor Border : - anterior : cornea - posterior : iris Muscle controlled iris movement - Sphincter pupillae circular bundle running round the pupillary margin, supplied by parasimpatic N. III

- Dilator pupillae run radially near the root of iris, suplied by motor nerve fibers derived from cervival sypathetic chain

TRABECULAR MESHWORK & AQUOUS FLOW

Aquous flow Aquous formed in ciliarry region Secreted to the posterior chamber Through the pupil Anterior chamber

Escapes trough the drainage channels Episcleral vein

THE LENS

Lens : biconves mass surounded by hyaline membrane ( lens capsule, held by suspensory ligament ( zonules zinii)

DURING ACCOMODATION THE CILIARY MUSCLES CONTRACTS DRAWING TOWARD THE CHOROID

RELAXING THE SUSPENSORY LIGAMENT DIMINISHES THE TENSION OF LENS CAPSULE INCREASE THE CONVEXITY OF THE LENS

UVEAL TRACT

CONSIST 3 PARTS : -THE CHOROID, - CILIARY BODY, -THE IRIS

THE RETINA CONSISTS OF 10 LAYERS

FOVEA : THE MOST SENSITIVE PART OF THE RETINA, SURROUNDED BY A SMALL AREAS, THE MACULA LUTEA OR YELLOW SPOT.

AT THE OPTIC DISC THE FIBERS OF THE NERVEFIBER LAYER PASS INTO THE OPTIC NERVE

VITREOUS

Vitreous base

vitreous cavity : expanded extracellular space, normally contains 4.0 ml of clear gelatinous substance, composed largely of water, hyaluronic acid, and collagen.

THE EXTRA OCULAR MUSCLES Extra Ocular Muscle • THE RECTUS MUSCLE - THE MEDIAL RECTUS - THE LATERAL RECTUS - THE SUPERIOR RECTUS - THE INFERIOR RECTUS • THE OBLIQUE MUSCLE - THE SUPERIOR OBLIQUE - THE INFERIOR OBLIQUE

RECTUS MUSCLES ROTATING THE EYE IN FOUR CARDINAL DIRECTIONS : UP, DOWN, OUT AND IN

THE OBLIQUE MUSCLES ROTATION OF THE GLOBE

THE EYE LIDS

THE SKIN OF THE LIDS IS THE THINNES AND ITS LOOSE ATTACHMENT

THE CILIA OR EYELASHES ARE STRONG SHORT CURVED HAIRS, ARRANGED IN TWO OR MORE CLOSELY SET ROWS THE SEBACEOUS GLANDS ARE CALLED ZEISS’S GLANDS AND THE SWEAT GLANDS ARE KNOWN AS MOLL’S GLANDS

THE TARSUS CONSISTS OF DENSE FIBROUS TISSUE; IT CONTAINS NO CARTILAGE, EMBEDDED IN IT ARE SOME ENORMOUSLY DEVELOPED SEBACEOUS GLAND : THE MEIBOMIAN GLANDS

Orbicularis Palpebra : -Occupies space between tarsus skin - Suplied by N. VII

THE LACRIMAL APPARATUS

THE LACRIMAL APPARATUS CONSISTS OF •THE LACRIMAL GLANDS •THE LACRIMAL PASSAGES

TEAR FLOWS

Physiology of Vision

SCHEMATIC OF VISUAL PATHWAY